生物学研究方法有观察、调查、分类、文献、实验等方法．其中，英国科学家珍妮在研究黑猩猩时发现黑猩猩能用草根从白蚁窝中钩出白蚁，珍妮的这种研究方法是____ ．珍妮进一步查找相关资料获取信息的方法是____．而为了要了解某地青少年的近视率，科学家们应该采用的方法是____

用括号里所给动词的适当形式填空。
(1)He often ____ (study) with his friends in the library after class.
(2)We should do more exercise ____  (keep) healthy.
(3)These magazines must not ____  (take) out of the reading room.
(4)  I called you this morning, but nobody answered it.
     Oh, we ____ (run) in the park.
(5)Jacky Chen ____  (star) in many action films for many years. I admire him very much.

东、西半球的分界线是（    ）